Type F screws have a thread cutting tip. A slotted hex washer head can be installed with either a wrench or a flat bladed screw driver, and has a built-in washer.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Slotted drive has a simple slot for a flat bladed screw driver.
The most common stainless steel for general hardware use.
Solid brass. An alloy of primarily copper and zinc with good corrosion resistance. Used mostly in decorative and electrical applications. Exact color varies.
Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.